package Demo_201;

/**
 * 不同  线程对象   修改  同一共享变量
 * 一个用synchronized关键字修饰代码块
 * 另一个不用synchronized修饰
 */
public class Demo_03 {
    public static void main(String[] args) throws InterruptedException {
        Count03 count = new Count03();
        Thread th1 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                count.increase();
            }
        });
        Thread th2 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                //没用synchronized修饰
                count.increase1();
            }
        });
        //启动线程
        th1.start();
        th2.start();
        //等待线程执行完毕
        th1.join();
        th2.join();
        //打印结果，预期结果为：100000
        System.out.println(count.count);
        //实际不到100000 有线程安全问题
    }
}
class Count03 {
    int count = 0;
    public void increase() {
        synchronized (this) {
            count++;
        }
    }
    public void increase1() {
        count++;
    }
}